Bianchi-I classical and quantum spinor cosmology with signature change

Details Bianchi-I classical and quantum spinor cosmology with signature change Bianchi-I classical and quantum spinor cosmology with signature change

2005-08-21

arxiv.org/abs/gr-qc/0508090v2

JCAP 0509 (2005) 008

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

11 pages, 1 figure

Scientific paper

10.1088/1475-7516/2005/09/008

We study the classical and quantum evolution of a universe in which the matter source is a massive Dirac spinor field and the universe is described by a Bianchi type I metric. We focus attention on those classical solutions that admit a degenerate metric in which the scale factors have smooth behavior in transition from a Euclidean to a Lorentzian domain and show that this transition happens when the cosmological constant, $\Lambda$, is negative. The resulting quantum cosmology and the corresponding Wheeler-DeWitt equation are also studied and closed form expressions for the wave functions of the universe is presented. We have shown that there is a close relationship between the quantum states and signature changing classical solutions, suggesting a mechanism for creation of a Lorentzian universe from a Euclidean region by a continuous change of signature. The quantum solutions also represent a quantization rule for the mass of the spinor field.

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